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/*

        aten.c  (c) 1997-8  Grant R. Guenther <grant@torque.net>

                            Under the terms of the GNU public license.

        aten.c is a low-level protocol driver for the ATEN EH-100

        parallel port adapter.  The EH-100 supports 4-bit and 8-bit

        modes only.  There is also an EH-132 which supports EPP mode

        transfers.  The EH-132 is not yet supported.

*/

/* Changes:

        1.01    GRG 1998.05.05  init_proto, release_proto

*/

#define ATEN_VERSION      "1.01"

#include <linux/module.h>

#include <linux/delay.h>

#include <linux/kernel.h>

#include <linux/types.h>

#include <asm/io.h>

#include "paride.h"

#define j44(a,b)                ((((a>>4)&0x0f)|(b&0xf0))^0x88)

/* cont = 0 - access the IDE register file

   cont = 1 - access the IDE command set

*/

static int  cont_map[2] = { 0x08, 0x20 };

static void  aten_write_regr( PIA *pi, int cont, int regr, int val)

{       int r;

        r = regr + cont_map[cont] + 0x80;

        w0(r); w2(0xe); w2(6); w0(val); w2(7); w2(6); w2(0xc);

}

static int aten_read_regr( PIA *pi, int cont, int regr )

{       int  a, b, r;

        r = regr + cont_map[cont] + 0x40;

        switch (pi->mode) {

        case 0: w0(r); w2(0xe); w2(6);

                w2(7); w2(6); w2(0);

                a = r1(); w0(0x10); b = r1(); w2(0xc);

                return j44(a,b);

        case 1: r |= 0x10;

                w0(r); w2(0xe); w2(6); w0(0xff);

                w2(0x27); w2(0x26); w2(0x20);

                a = r0();

                w2(0x26); w2(0xc);

                return a;

        }

        return -1;

}

static void aten_read_block( PIA *pi, char * buf, int count )

{       int  k, a, b, c, d;

        switch (pi->mode) {

        case 0:  w0(0x48); w2(0xe); w2(6);

                for (k=0;k<count/2;k++) {

                        w2(7); w2(6); w2(2);

                        a = r1(); w0(0x58); b = r1();

                        w2(0); d = r1(); w0(0x48); c = r1();

                        buf[2*k] = j44(c,d);

                        buf[2*k+1] = j44(a,b);

                }

                w2(0xc);

                break;

        case 1: w0(0x58); w2(0xe); w2(6);

                for (k=0;k<count/2;k++) {

                        w2(0x27); w2(0x26); w2(0x22);

                        a = r0(); w2(0x20); b = r0();

                        buf[2*k] = b; buf[2*k+1] = a;

                }

                w2(0x26); w2(0xc);

                break;

        }

}

static void aten_write_block( PIA *pi, char * buf, int count )

{       int k;

        w0(0x88); w2(0xe); w2(6);

        for (k=0;k<count/2;k++) {

                w0(buf[2*k+1]); w2(0xe); w2(6);

                w0(buf[2*k]); w2(7); w2(6);

        }

        w2(0xc);

}

static void aten_connect ( PIA *pi  )

{       pi->saved_r0 = r0();

        pi->saved_r2 = r2();

        w2(0xc);

}

static void aten_disconnect ( PIA *pi )

{       w0(pi->saved_r0);

        w2(pi->saved_r2);

}

static void aten_log_adapter( PIA *pi, char * scratch, int verbose )

{       char    *mode_string[2] = {"4-bit","8-bit"};

        printk("%s: aten %s, ATEN EH-100 at 0x%x, ",

                pi->device,ATEN_VERSION,pi->port);

        printk("mode %d (%s), delay %d\n",pi->mode,

                mode_string[pi->mode],pi->delay);

}

static void aten_init_proto( PIA *pi )

{       MOD_INC_USE_COUNT;

}

static void aten_release_proto( PIA *pi )

{       MOD_DEC_USE_COUNT;

}

struct pi_protocol aten = {"aten",0,2,2,1,1,

                           aten_write_regr,

                           aten_read_regr,

                           aten_write_block,

                           aten_read_block,

                           aten_connect,

                           aten_disconnect,

                           0,

                           0,

                           0,

                           aten_log_adapter,

                           aten_init_proto,

                           aten_release_proto

                          };

#ifdef MODULE

int     init_module(void)

{       return pi_register( &aten ) - 1;

}

void    cleanup_module(void)

{       pi_unregister( &aten );

}

#endif

/* end of aten.c */